Unmatt, Mad Inventor

token artifacts you control are 2/2 creatures with vigilance, flying and haste in addition to its other
types
whenever a token is sacrificed, you may pay {x}. If you do, Reveal cards from the top of your library until you reveal a creature or artifact
card with mana value less than {x}. Put that card
onto the battlefield and the rest on the bottom
of your library in a random order.